Gas range top grate and burner



March 7, 1950 H. WARREN GAS RANGE TOP GRATE AND BURNER 2 Sheets-Sheet -lFiled Aug. 5, 1944 March 7, 1950 W R 7 2,4993%? GAS RANGE TOP GRATE ANDBURNER Filed Aug. 5, 1944 2 Sheets-Sheet 2 41 k 7 &

Patented Mar. 7, 1950 UNITED STATES PATENT OFFICE GAS RANGE TOP GRATEAND BURNER Application August 5, 1944, Serial No. 548,253

'7 Claims. 1

My invention relates to gas range top grates and burners, and among theobjects of my invention are:

First, to provide a gas range top grate and burner which gives improvedheat distribution and operates with greater efliciency than conventionalburners.

Second, to provide a gas range top grate and burner wherein the grate isin the form of a smooth flat unperforated plate which is particularlyeasy to clean, and which protects the burner ports from liquid which maybe spilled on the range during cooking.

Third, to provide a gas range top grate and burner which affordsadequate support for both large and small utensils to minimize thepossibility of spilling.

Fourth, to provide a burner and top grate which is so arranged that theburner flame does not come in direct contact with the bottom or sidewalls of the utensils.

With the above and other objects in view as may appear hereinafter,reference is directed to the accompanying drawings, in which Fig. 1 is aplan view of a gas range incorporating my top grate and burners.

Fig. 2 is an enlarged fragmentary sectional View thereof, taken through22 of Fig. 1.

Fig. 3 is a plan view of my top grate adapted to an otherwiseconventional burner, with a portion of the top grate broken away to showthe burner thereunder.

Fig. 4 is a sectional view of the top grate and burner, taken through4-4 of Fig. 3.

Fig. 5 is a bottom view of the top grate.

My top grate and burner may be adapted to various types and styles ofgas ranges. For convenience the gas range I itself is represented moreor less diagrammatically. The gas range includes a top plate 2 having asuitable burner opening 3 therein. Within each burner opening is a mainburner 4 which includes an annular head 5. The head 5 is hollow anddefines a mixing chamber 6. The upper annular end of the head 5 isprovided with upwardly and outwardly directed burner ports 1. One ormore vertically disposed Venturi tubes 8 communicate with the lowerannular end of the head 5. At the lower end of each Venturi tube isformed an air chamber 9 in which is positioned as gas nozzle ID. The airchamber 9 is provided with air intake ports II, the areas of which maybe adjusted to regulate the primary air supply by suitable means such asan air valve I2 in the form of a ported cylindrical sleeve surroundingthe air chamber 9.

Within the space formed by the main burner 4 is positioned a simmerburner I3. The upper end of the simmer burner in this modificationsupports a top grate I4 in the form of a flat plate of uniform thicknessexcept for a central threaded stem I5 which screw-threads into the upperend of the simmer burner I3. The simmer burner defines with the stem I5a mixing chamber I6 having laterally directed ports I! located above thehead 5 of the main burner 4. The simmer burner I3 includes a Venturisection I8, similar to the Venturi tubes 8.

At the lower end of the Venturi section I8 is an air chamber I9 intowhich extends a gas nozzle 20. Air intake ports 2| are provided in theside walls of the air chamber I9 and the areas of the intake ports 2Iare regulated by an air valve 22, similar to the air valve I2.

It is preferred that the top plate 2 of the range be provided with anupturned rounded rim 23 around each opening 3. An annular burner guard24 is provided with a curved outer flange 25 which fits over the rim 23,as shown best in Fig. 2. Each burner guard 24 curves downwardly andinwardly from its outer flange and terminates in an annular gutterchannel 26 located below the burner ports I and radially within theperiphery of the top grate I4. The top grate is set above the burnerguard 24, to provide an annular clearance space 21.

The top grate I4 provides a smooth flat easily cleaned surface uponwhich to set cooking vessels. The grate is large enough to support thelarger vessels and provide full support for the smaller vessels. Byreason of the fact that the top grate extends radially, a considerabledistance beyond the burner ports I, no flame comes into direct contactwith the utensils, whether large or small. The hereinbefore describedstructure eliminates one of the difiiculties inherent in the standardtype of gas burners; namely, the problem of heat distribution at lowburner input while avoiding concentration of heat at the center of theutensil. If in the conventional type of burner a simmer burner isincorporated, low burner heat input is possible but the heat isconcentrated at the center of the utensil. If the simmer burner isomitted and the main burner is employed, it will be difiicult to turn itlow enough to function for simmering purposes without danger of blowout;in any event the burner input is higher than desirable. Tests have shownthat the heat distribution by operation of the simmer burner alone isevenly distributed over the surface of the top grate illustrated.

Both iron and brass plates have been employed to form the top grate l4and both provide an evenly distributed heat pattern Over the entiresurface.

Reference is now directed to the construction shown in Figs. 3, 4' and5. The burner structure per se herein illustrated may be considered asconventional. That is, I have found it possible to add a top grate to aconventional burner of at least one particular styleand accomplishresults which were comparable to those obtained by means of the firstdescribed structure. The burner indicated generally by 31 iscommercially available. It comprises a mainconduit 32 which has twopassages therein, one-terminating inan upturned simmer branch 33; and asimmer burner 34 is mounted at the extremity of the simmer branch 33.

A mainburnerbranch 35; which may be-separated from the conduit 32; butwhich extends upwardly from the: other passage contained in the conduit32 anditerminatesina ringchamber 36 disposed concentrically with respecttothe simmer burner 34'. Thering chamber 355 isopen at itsupper end andis adapted tobe closed by a' cover plate 3-! having a hollow stem 38which.

is externally threaded for connection with an internally threaded wallof the ring chamber 35.-

The outer periphery of' the cover plate 31 at its underside forms withthecorresponding sideof thering chamberxiifia series of laterally-directedupwardly inclined burner ports 39; A burner grate 40,incorporating the features of the top grate: l4 inthe firstldescribedstructure, is mounted -on.the cover plate 37 The burner grate in thismodification comprises-a top plate member 4!" havinga plurality of feetSZ-adapted to support the grate upon the burner plate 3'! and isattachedthereto by screws 43.

An annular burner'guard 2 such asshown in the above described.structure, may be pro vided under the periphery of the burner grate 40.

It should be pointed= out that the cover plate 3'! and theboss' 42 maybemadeintegral witheach' other, instead: of separated, as shown.

The operation. of" the burner grate shown in Figs. 8, 4 and fiisessentially the same as-that shown in the previously describedstructure; andthe advantages gained by the top grate M are likewisegained by the'burner grate 40.

Many other embodiments of the invention may be resorted to withoutdeparting from the spirit of the invention.

I claim:

1. A gas range device of the class described, comprising: a range topsheet having a burnerreceiving opening, the margins of said opening atfirst curving upwardly from the normal level of the top sheet to form araised outer rim and then curving downwardly and terminating in anupturned inner rim depressed below the normal level of said range topsheet; a burner structure for said opening including an annular outermain burner and an inner simmer burner; and a utensil-supporting grateplate in the-form of a fiat unperforated disk carried by said burnerstructure and extending radially beyond said main burner and over thedepressed margins of said opening in spaced relation therewith and intocontiguous relation with said upraised outer rim to define therewith anuninterrupted annular outlet.

2.- A gas range device of the class described,

comprising: a range top sheet having a plurality of burner receivingopenings, each bordered by an upwardly curved rim; an annular burnerguard including an upwardly curved outer margin conforming to themarginal rim of said opening and a depressed channel bordering its innermargin and forming an upturned inner rim above said channel but belowthe normal surface of said top sheet; a burner unit for each burneropening, said burner unit including an annular main burner projectingabove the inner rim of said burner guard'and having radially directedburner orifices, an inner simmer burner projecting above said mainburner and having radially directed burner orifices; the-burner orificesof said main and simmer burner being between the planes definedby theupwardly curved outer marginal portion and upturned inner rim of saidburner guard; and a utensil-supporting grate plate in the form of a fiatdisk. carried by said burner structurasaid plate projecting radiallybeyond said main burner and: positioned above said burner guard, andterminating in spacedrelation with the outer margin: of said'burneirguard' to form an uninterrupted' annulardischarge opening for theproducts of combustion.

3. A gas range device of the class described, comprising: a rangetopsheet' having aplurality of burner receiving iopenings; each.bordered. by an' upwardly curved' rim; an annular" burner guard havingan outer margin conforming to the margin of said opening. and. a:depressed inner rim depressed below the outer. rim and defining an:upwardly facing channel; a'. burner unit for each burner opening, saidburner unit including an annularmain; burner-projecting above the innerrim of said burner guard andhaving radially directed burner: orifices.an innersimmer burner projecting above-said main burner andhavingradially directed. burner orifices, the burner orifices of said mainand'simmer burner being between the' planes' defined by. the upwardly curvedouter marginal portion and upturned inner rim ofrsaid burnen-guard; anda utensilsupporting'grate? plate in theform of a flat disk carried bysaid burner-structure, said plate projecting radially beyond said mainburner and positioned above said burnenguard, and terminating in' spacedrelation with the-outer margin of said burner guard' to form: anuninterrupted annular discharge openingaior the products of combustion.

4. A gas'range structure comprising: a main burner of annularform-having radia ly directed burner ports; asimmer'burner extendingupwardly through and spaced from the main burner, said simmer burnerhaving radially directed burner portsdocated above'the upper end of themain burner; an imperforate grate plate mounted on said. simmer burnerand extending over andbeyond the'outerperiphery of saiclmain burner inspaced relation therewith; 'an:annular burner guard ring surroundingsaidmain burner and spacedfrom said' main burner and grate plate to definetherewith a combustion zone; said guard ring having'an upturned innermarginal rim disposedbelow the ports of said-main burner, and anupturned outer marginal rim disposed above the level of said main burnerports and radially outward'ofa the periphery of said grate plate.

5. A gas range structure comprising? a main burner of annular formhaving radially directed burner ports; a simmer burnersof' relativelysmall diameterflextendings upwardly through, the annulus formed by themain burner and spaced from the walls thereof to define therewith anannular air passage, said simmer burner having ports directed radiallyoutwardly over said main burner; an imperforate grate plate supported bysaid simmer burner and extending over and beyond the main burner inspaced relation therewith, thereby to define with the main burner aradially directed combustion zone for said simmer burner and ignitionpassage through which an ignition flame may travel between said burners;an annular burner guard ring surrounding said main burner and spacedfrom said main burner and grate plate to define therewith a combustionzone; said guard ring having an upturned inner marginal rim disposedbelow the ports of said main burner, and an upturned outer marginal rimdisposed above the level of said main burner ports and radially outwardof the periphery of said grate plate.

6. A gas range device as set forth in claim 1, wherein: said simmerburner projects above the outer burner unit and is provided withoutwardly directed burner jets; and said utensil-supporting grate plateis carried by said simmer burner.

6 utensil-supporting grate plate is carried by said main'burner anddefines therewith lateral apertures for escape of the products ofcombustion from, said simmer burner.

HARRY L. WARREN.

REFERENCES CITED The following references are of record in the o file ofthis :patent:

UNITED STATES PATENTS Number Name Date 527,566 Wallace Oct. 16, 18941,671,192 Kahn May 29, 1928 1,959,657 Chambers May 22, 1934 2,059,534Pratt et a1 Nov. 3, 1936 2,088,652 Hobson Aug. 3, 1937 2,148,777Schneider Feb. 28, 1939 2,166,442 Kahn July 18, 1939 2,196,339 Noe Apr.9, 1940 2,285,278 Hennessy June 2, 1942 2,337,095 Frick Dec. 21, 1943FOREIGN PATENTS Number Country Date 324,657 France Dec. 19, 1902 785,164France Mar. 13, 1935 859,286 France Dec. 14, 1940

